If I choose transparent plastic, does it affect the vibrancy of the card?

Transparent plastic is popular for plastic business cards. You need to keep the material in mind when you design your card as it does affect the vibrancy of the card — especially with lighter colors. We will often add white ink to the card to make the certain colors more vibrant. The level of transparency/color vibrancy may not be fully reflected in a proof. If you have not printed on transparent plastic before, we highly recommend a press proof.